Alright, so I have a few Biology questions - if anyone can explain the answers, I'd be much obliged. I DON'T JUST WANT A LETTER ANSWER.
When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
A) Cells are open systems, but a test tube is a closed system.
B) Cells are less efficient at heat production than nonliving systems.
C) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube.
D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes.
E) Reactant and product concentrations are not the same
(The answer is E. Explanation?)
Sucrose is a disaccharide, composed of the monosaccharides glucose and fructose. The hydrolysis of sucrose by the enzyme sucrase results in
A) bringing glucose and fructose together to form sucrose.
B) the release of water from sucrose as the bond between glucose and fructose is broken.
C) breaking the bond between glucose and fructose and forming new bonds from the atoms of water.
D) production of water from the sugar as bonds are broken between the glucose monomers.
E) utilization of water as a covalent bond is formed between glucose and fructose to form sucrase.
(The answer is C. Why isn't it B?)
During a laboratory experiment, you discover that an enzyme -catalyzed reaction has a △G of -20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the △G for the new reaction?
A) -40 kcal/mol
B) -20 kcal/mol
C) 0 kcal/mol
D) +20 kcal/mol
E) +40 kcal/mol
(The answer is B. Why does the △G stay the same?)
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme
carboxypeptidase. The zinc most likely functions as a(n)
When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
A) Cells are open systems, but a test tube is a closed system.
B) Cells are less efficient at heat production than nonliving systems.
C) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube.
D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes.
E) Reactant and product concentrations are not the same
(The answer is E. Explanation?)
Sucrose is a disaccharide, composed of the monosaccharides glucose and fructose. The hydrolysis of sucrose by the enzyme sucrase results in
A) bringing glucose and fructose together to form sucrose.
B) the release of water from sucrose as the bond between glucose and fructose is broken.
C) breaking the bond between glucose and fructose and forming new bonds from the atoms of water.
D) production of water from the sugar as bonds are broken between the glucose monomers.
E) utilization of water as a covalent bond is formed between glucose and fructose to form sucrase.
(The answer is C. Why isn't it B?)
During a laboratory experiment, you discover that an enzyme -catalyzed reaction has a △G of -20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the △G for the new reaction?
A) -40 kcal/mol
B) -20 kcal/mol
C) 0 kcal/mol
D) +20 kcal/mol
E) +40 kcal/mol
(The answer is B. Why does the △G stay the same?)
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme
carboxypeptidase. The zinc most likely functions as a(n)
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